Feat: Add secondary constructor to SentryInstrumentation.

[maciejwalkowiak]

📜 Description

Feat: Add secondary constructor to SentryInstrumentation.

💡 Motivation and Context

It wasn't possible to pass BeforeSpanCallback without passing the Hub.

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes
• I updated the docs if needed
• No breaking changes

🔮 Next steps

[codecov-commenter]

Codecov Report

Merging #1804 (0b7b0b9) into main (5ba7d38) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##               main    #1804      +/-   ##
============================================
- Coverage     75.74%   75.72%   -0.02%     
  Complexity     2194     2194              
============================================
  Files           218      218              
  Lines          7804     7806       +2     
  Branches        828      828              
============================================
  Hits           5911     5911              
- Misses         1491     1493       +2     
  Partials        402      402              

Impacted Files	Coverage Δ
.../java/io/sentry/graphql/SentryInstrumentation.java	71.18% <0.00%> (-2.50%)	⬇️

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